Study on Current-carrying Improvement of J-tubes Section of ±250 kV DC Submarine Cable

CUI Rongjian; XIAO Pai; WU Gaobo; LI Jian; DU Zhiye; HAO Zhaoyang

doi:10.13296/j.1001-1609.hva.2022.01.009

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Study on Current-carrying Improvement of J-tubes Section of ±250 kV DC Submarine Cable

更新时间：2025-04-26

- Study on Current-carrying Improvement of J-tubes Section of ±250 kV DC Submarine Cable
- High VoltageApparatus Vol. 58, Issue 1, Pages: 61-69(2022)
- 作者机构：
  
  1. 中国电力工程顾问集团中南电力设计院有限公司
  2. 武汉大学电气与自动化学院
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2022.01.009
  CLC： TM75;P756.1
- Published：2022
- 稿件说明：
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CUI Rongjian, XIAO Pai, WU Gaobo, et al. Study on Current-carrying Improvement of J-tubes Section of ±250 kV DC Submarine Cable[J]. High voltageapparatus, 2022, 58(1): 61-69.
DOI：

CUI Rongjian, XIAO Pai, WU Gaobo, et al. Study on Current-carrying Improvement of J-tubes Section of ±250 kV DC Submarine Cable[J]. High voltageapparatus, 2022, 58(1): 61-69. DOI： 10.13296/j.1001-1609.hva.2022.01.009.

摘要

J型管作为新型电力系统中新能源海上风电送出系统海底电缆的保护装置

其存在会阻碍海缆对外散热

制约整条风电送出线路的载流量。为了提高J型管段海缆载流量

文中建立了典型J型管段流体—温度耦合数值模型

仿真分析了环境风速、太阳辐射、环境温度对直流±250 kV海底电缆封闭J型管系统温度场的影响规律

确定J型管载流量瓶颈位置

提出了一种J型管外壁开孔配合平台开孔引入外界风的J型管载流量提升方法

验证了仿真模型与算法的正确性。结果表明与全封闭J型管系统相比

J型管外壁开孔配合平台开孔能有效降低海缆温度

环境风速较低为1 m/s时载流量可有效提升13.98%。研究结果为指导J型管设计提升J型管段海缆载流量提供了新的解决方案。

Abstract

As the protection device of submarine cable of new energy offshore wind power transmission system in new power system

J-tube has such problem as hinders the external heat dissipation of cable and restricts the carrying capacity of the whole wind power transmission line. For improving the carrying capacity of J-tube section of cable

a fluid-temperature coupling numerical model of typical J-tube section is set up in this paper. The influence of environmental wind speed

solar radiation and ambient temperature on temperature field of closed J-tube system of DC ±250 kV submarine cable is simulated and analyzed

and the bottleneck position of J-tube carrying capacity is determined. A kind of method of J-tube carrying capacity improvement is proposed

in which the opening of J-tube wall is combined with the opening of platform to introduce external air and the correctness of the simulation model and algorithm is verified. The results show that

compared to a fully enclosed J-tube system

the opening on the outer wall of J-tube combined with the opening on the platform can effectively reduce temperature of the cable and

in case the ambient wind speed is low to 1 m/s

the carrying capacity can effectively increase 13.98%. The research results provide a new solution for guiding the design of J-tube and improving the carrying capacity of cable of J-tube section.

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